Which best defines partial pressure in a mixture of gases?

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Question:

Which best defines partial pressure in a mixture of gases?pressure that is exerted by all the gases of a mixture on the container
pressure that is exerted by one gas as if it occupied a container by itself
half of the pressure that is exerted by the gases of a mixture on the container
sum of the individual pressures that are exerted by two or more gases

Answer:

Considering the Dalton’s partial pressure, the correct answer is the second option: “pressure that is exerted by one gas as if it occupied a container by itself” defines partial pressure in a mixture of gases.

Dalton’s law

The pressure exerted by a particular gas in a mixture is known as its partial pressure.

So, Dalton’s law states that the total pressure of a gas mixture is equal to the sum of the pressures that each gas would exert if it were alone:

where n is the amount of gases present in the mixture.

This relationship is due to the assumption that there are no attractive forces between the gases.

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Dalton’s partial pressure law can also be expressed in terms of the mole fraction of the gas in the mixture. The mole fraction is a dimensionless quantity that expresses the ratio of the number of moles of a component to the number of moles of all the components present.

So in a mixture of two or more gases, the partial pressure of gas A can be expressed as:

In summary, the correct answer is the second option: “pressure that is exerted by one gas as if it occupied a container by itself” defines partial pressure in a mixture of gases.

Learn more about Dalton’s partial pressure:

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